Pi-minus he-4 inelastic and capture reactions leading to excited and multineutron final states
19689 pages
Published in:
- Phys.Rev. 175 (1968) 1358-1366
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Abstract: (APS)
A beam of (140±0.5)-MeV π− was produced at the Berkely 184-in. cyclotron and used to study the finalstate interactions of three and four neutrons, and to look for excited levels of the α particle through the reactions {π−+He4,→π−+He*4,}{→p+3n,}{→d+2n,}{→π++4n.} Only one such level is found, with an excitation energy of 32 MeV and an intrinsic width smaller than our 1-MeV resolution. We find that our data on the four-neutron final state, although not inconsistent with phase space, agree more closely with the assumption that there is a S01 final-state interaction between two of the neutrons, the other two not interacting. We find, too, that deuteron production is down by a factor of ≈103 from proton production, and that the proton spectrum indicates a stronger-than-expected interaction between the three neutrons in the final state. Lower limits for the production of a tri- or tetraneutron are set.- pion minus-helium: interaction
- interaction: pion minus-helium
- final states 3
- p: 3 neutrons
- deuterium: 2 neutrons
- pion plus: 4 neutrons
- final state
- plus: final state
- final state: plus
- capture
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